Comfort Stat CDT901 - Manual (Page 96)

CDT900 Series Touchscreen Programmable Thermostata
Table 11. Sequence of Operation for Heat Pump Systems.
System Setting Fan Setting Call for Action Energize Terminals Screen Message
Off Auto None O/Ba None
Cool Auto None O/Ba None
Cool or Auto Auto Stage 1 Cooling Y, G, O/B
a
Cool On
Cool or Auto Auto
Stage 1 and Stage 2
Cooling
Y, Y2
d
, G, O/B
a
Cool On
Heat Auto None O/B
a
None
Heat or Auto Auto Stage 1 Heating Y, G, O/B
a
Heat On
Heat or Auto Auto
Stage 1 and Stage 2
Heating
Y, AUX
c
, G, O/B
a
Aux Heat On
Heat or Auto Auto
Stage 1, 2 and 3
Heating
Y, Y2d, AUX
e
, G,
O/B
a Aux Heat On
Em. Heat Auto None L
b
, O/B
a
None
Em. Heat Auto Stage 1 Heating E, G, Lb, O/B
a
Heat On
Em. Heat Auto
Stage 1 and Stage 2
Heating
E, AUX, G, L
b
, O/B
a
Aux. Heat On
a
Configure O/B in Installer Setup. Based on last piece of equipment called (cooling = O or
heating = B).
b
Red LED is on. See LED Indication section for more details.
c
If Installer Setup System Type is set to 2Heat/1Cool Heat Pump with Auxiliary Heat.
d
If Installer Setup System Type is set to 3Heat/2Cool Heat Pump with Auxiliary Heat.
e
This terminal does not energize if Installer Setup System type is set to 2 Heat/2 Cool Heat
Pump with no Auxiliary Heat
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